Data / Highest daily Air Quality Index (US EPA) / Wallowa County

Highest daily Air Quality Index (US EPA) in Wallowa County

Highest daily Air Quality Index (US EPA) in Wallowa County was 88 in 2025, according to the U.S. Environmental Protection Agency. That is down 37 from 2024.

2025, index88
Change on 2024-37
Series high2222020
Series low542000

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Highest daily Air Quality Index (US EPA) in Wallowa County, 2000 to 2025

5010015020025020002004200820122016202020252000: 54 index2001: 61 index2002: 60 index2003: 56 index2004: 61 index2005: 99 index2006: 127 index2007: 136 index2008: 83 index2009: 77 index2010: 162 index2011: 88 index2012: 150 index2013: 98 index2014: 121 index2015: 185 index2016: 78 index2017: 177 index2018: 118 index2019: 103 index2020: 222 index2021: 162 index2022: 195 index2023: 82 index2024: 125 index2025: 88 index5010015020025020002009201820252000: 54 index2001: 61 index2002: 60 index2003: 56 index2004: 61 index2005: 99 index2006: 127 index2007: 136 index2008: 83 index2009: 77 index2010: 162 index2011: 88 index2012: 150 index2013: 98 index2014: 121 index2015: 185 index2016: 78 index2017: 177 index2018: 118 index2019: 103 index2020: 222 index2021: 162 index2022: 195 index2023: 82 index2024: 125 index2025: 88 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 26 values
Periodindex
202588
2024125
202382
2022195
2021162
2020222
2019103
2018118
2017177
201678
2015185
2014121
201398
2012150
201188
2010162
200977
200883
2007136
2006127
200599
200461
200356
200260
200161
200054

Wallowa County compared with nearby places

Baker County: 85 indexClackamas County: 119 indexColumbia County: 69 indexCrook County: 144 indexDeschutes County: 153 indexGrant County: 89 indexHarney County: 93 indexJackson County: 152 indexJefferson County: 90 indexJosephine County: 208 indexKlamath County: 149 indexLake County: 105 indexLane County: 153 indexLinn County: 122 indexMarion County: 85 indexMultnomah County: 87 indexUmatilla County: 95 indexUnion County: 79 indexWallowa County: 88 indexWasco County: 81 indexWashington County: 88 index
  • Under 85
  • 85 to 89
  • 89 to 110
  • 110 to 150
  • 150 and over
  • No data
Highest daily Air Quality Index (US EPA), 2025, index. Wallowa County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

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How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: highest daily AQI (Highest daily Air Quality Index (US EPA), Wallowa County, 2000 to 2025) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Wallowa County, 2000 to 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/wallowa-county-oregon. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Wallowa County, 2000 to 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/wallowa-county-oregon.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Wallowa County, 2000 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/wallowa-county-oregon (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Wallowa County, 2000 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/wallowa-county-oregon. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download\_files.html\#Annual. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Wallowa County, 2000 to 2025
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/en/highest-daily-air-quality-index/wallowa-county-oregon
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/wallowa-county-oregon.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the highest daily Air Quality Index (US EPA) in Wallowa County?

Highest daily Air Quality Index (US EPA) in Wallowa County was 88 in 2025, according to the U.S. Environmental Protection Agency. That is down 37 from 2024.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: highest daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest highest daily Air Quality Index (US EPA) in Wallowa County?

222 in 2020, the highest value since 2000 in this series.

Related statistics for Wallowa County

All statistics for Wallowa County | Wallowa County in figures